Our FILMTEC™ commercial nanofiltration membrane provides high productivity performance while removing a high percentage of salts, nitrate, iron and organic compounds such as pesticides, herbicides, TOC and THM precursors with medium to high salt passage and medium hardness passage. The low net driving pressure of this membrane allows the removal of these compounds at low operating pressures. An ideal choice for surface water and ground water where good organic removal is desired with partial softening.
Important Information Proper start-up of reverse osmosis water treatment systems is essential to prepare the membranes for operating service and to prevent membrane damage due to overfeeding or hydraulic shock. Following the proper start-up sequence also helps ensure that system operating parameters conform to design specifications so that system water quality and productivity goals can be achieved. Before initiating system start-up procedures, membrane pretreatment, loading of the membrane elements, instrument calibration and other system checks should be completed. Please refer to the application information literature entitled “Start-Up Sequence” (Form No. 609-02077) for more information.
Avoid any abrupt pressure or cross-flow variations on the spiral elements during start-up, shutdown, cleaning or other sequences to prevent possible membrane damage. During start-up, a gradual change from a standstill to operating state is recommended as follows:
Feed pressure should be increased gradually over a 30-60 second time frame.
Cross-flow velocity at set operating point should be achieved gradually over 15-20 seconds.
Permeate obtained from first hour of operation should be discarded.
Keep elements moist at all times after initial wetting.
If operating limits and guidelines given in this bulletin are not strictly followed, the limited warranty will be null and void.
To prevent biological growth during prolonged system shutdowns, it is recommended that membrane elements be immersed in a preservative solution.
The customer is fully responsible for the effects of incompatible chemicals and lubricants on elements.
Maximum pressure drops are 15 psi (1.0 bar) per element or 50 psi (3.4 bar) per multi-element pressure vessel (housing) whichever value is more limiting.
Avoid static permeate-side backpressure at all times.
Notice: The use of this product in and of itself does not necessarily guarantee the removal of cysts and pathogens from water. Effective cyst and pathogen reduction is dependent on the complete system design and on the operation and maintenance of the system.
FILMTEC Corporation is the leading manufacture of reverse osmosis and nanofiltration membrane elements for industrial, municipal, commercial, and home drinking water treatment and purification, as well as for other specialty applications. The company was incorporated in 1977 and is headquartered in Minneapolis, Minnesota. FILMTEC Corporation is a subsidiary of The Dow Chemical Company and part of Dow's Water & Process Solutions business group.
Manufacture Item Code
GPD(Gallon per Day)
Active Area Ft2 (m2)
Permeate Tube (in)
Stablized Salt Rejection %
Dimensions W x L (in)
3.9" x 40"
1. Permeate flow rate and salt rejection based on the following test conditions: 2000 ppm MgSO at 70 psig, 77°F (25°C), pH 8 and 15% recovery.
Permeate flows for 2540 membranes may vary by -20%/+30%. For 4040 membranes by -15%/+50%.
Minimum stabilized salt rejection is 98.0%.
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